I made the mistake of transplanting some in my garden and I know why they are considered invasive! They have a tough root to eradicate and they multiply quite quickly taking over plants that are not so rugged! I made a bed just for them that they can do their thing but they spread by seed too so it seems I'm always digging up the young plants before they take hold. The roots can get quite succulent so it's good to know they are edible! The hummingbirds love them and I think they are beautiful but I would be careful where you pur them.